Senior Mechanical Design Engineer (Contract / Temporary - Onsite)

We are seeking a highly capable Senior Mechanical Design Engineer (contract/temporary) to support ongoing product development and improvement efforts. This is a hands-on, execution-focused role centered on improving existing designs, building hardware, and driving real-world performance.The ideal candidate has 8+ years of experience, strong Onshape proficiency, and thrives in a fast-paced, highly collaborative onsite environment.ROLES AND RESPONSIBILITIESDesign and improve components and systems based on existing products ("like design")Develop and release mechanical designs using OnshapeDrive improvements in performance, manufacturability, and reliabilitySupport testing, root cause analysis, and design iterationPrototype and evaluate alternative design approachesContribute to system integration (mechanisms, motion systems, assemblies)Develop and refine assembly and test processesCollaborate cross-functionally with engineering, manufacturing, and field teamsBuild, assemble, and validate prototypes and hardware hands-on8+ years of mechanical design experienceStrong proficiency with Onshape (required)Experience across key domains: machined parts, sheet metal, plastics, mechanisms, power transmission, and thermal systemsExperience with testing, debugging, and iterative designStrong understanding of DFM and practical manufacturing considerationsHands-on capability, including building and validating designs independentlyExperience with electromechanical systems and system integrationAbility to adapt and improve existing designsComfortable working onsite in a collaborative environmentNice to have:Experience with large weldments and structural design (FEA a plus)Experience working around rotating machineryBackground in reliability, failure analysis, or assembly/test process development Engagement DetailsType: Contract / TemporaryLocation: Onsite (no remote)Duration: 6 month +Start: ImmediateGrowth Opportunity: This role has the potential to convert to a full-time position based on performance and business needsImpact of the RoleThis role is critical to driving near-term design execution, product improvements, and reliability gains. You will directly influence the performance and success of systems deployed in real-world environments.Additional InformationLocation: This role is based in Burlington, MA. We are seeking local candidates, as relocation assistance is not available.Work Authorization: Applicants must be authorized to work in the U.S. on a full-time basis. We are unable to provide visa sponsorship for this position currentlyCompensation details: 70-100 Hourly WagePId3445e4bad7e-31181-40549673